import { createElement } from 'react' import ReactDOM from 'react-dom' import HeadManager from './head-manager' import { createRouter } from '../lib/router' import EventEmitter from '../lib/EventEmitter' import App from '../lib/app' import { loadGetInitialProps, getURL } from '../lib/utils' import PageLoader from '../lib/page-loader' import * as asset from '../lib/asset' // Polyfill Promise globally // This is needed because Webpack2's dynamic loading(common chunks) code // depends on Promise. // So, we need to polyfill it. // See: https://github.com/webpack/webpack/issues/4254 if (!window.Promise) { window.Promise = Promise } const { __NEXT_DATA__: { props, err, page, pathname, query, buildId, chunks, assetPrefix }, location } = window // With dynamic assetPrefix it's no longer possible to set assetPrefix at the build time // So, this is how we do it in the client side at runtime __webpack_public_path__ = `${assetPrefix}/_next/webpack/` //eslint-disable-line // Initialize next/asset with the assetPrefix asset.setAssetPrefix(assetPrefix) const asPath = getURL() const pageLoader = new PageLoader(buildId, assetPrefix) window.__NEXT_LOADED_PAGES__.forEach(({ route, fn }) => { pageLoader.registerPage(route, fn) }) delete window.__NEXT_LOADED_PAGES__ window.__NEXT_LOADED_CHUNKS__.forEach(({ chunkName, fn }) => { pageLoader.registerChunk(chunkName, fn) }) delete window.__NEXT_LOADED_CHUNKS__ window.__NEXT_REGISTER_PAGE = pageLoader.registerPage.bind(pageLoader) window.__NEXT_REGISTER_CHUNK = pageLoader.registerChunk.bind(pageLoader) const headManager = new HeadManager() const appContainer = document.getElementById('__next') const errorContainer = document.getElementById('__next-error') let lastAppProps export let router export let ErrorComponent let ErrorDebugComponent let Component let stripAnsi = (s) => s export const emitter = new EventEmitter() export default async ({ ErrorDebugComponent: passedDebugComponent, stripAnsi: passedStripAnsi } = {}) => { // Wait for all the dynamic chunks to get loaded for (const chunkName of chunks) { await pageLoader.waitForChunk(chunkName) } stripAnsi = passedStripAnsi || stripAnsi ErrorDebugComponent = passedDebugComponent ErrorComponent = await pageLoader.loadPage('/_error') try { Component = await pageLoader.loadPage(page) } catch (err) { console.error(stripAnsi(`${err.message}\n${err.stack}`)) Component = ErrorComponent } router = createRouter(pathname, query, asPath, { pageLoader, Component, ErrorComponent, err }) router.subscribe(({ Component, props, hash, err }) => { render({ Component, props, err, hash, emitter }) }) const hash = location.hash.substring(1) render({ Component, props, hash, err, emitter }) return emitter } export async function render (props) { if (props.err) { await renderError(props.err) return } try { await doRender(props) } catch (err) { if (err.abort) return await renderError(err) } } // This method handles all runtime and debug errors. // 404 and 500 errors are special kind of errors // and they are still handle via the main render method. export async function renderError (error) { const prod = process.env.NODE_ENV === 'production' // We need to unmount the current app component because it's // in the inconsistant state. // Otherwise, we need to face issues when the issue is fixed and // it's get notified via HMR ReactDOM.unmountComponentAtNode(appContainer) const errorMessage = `${error.message}\n${error.stack}` console.error(stripAnsi(errorMessage)) if (prod) { const initProps = { err: error, pathname, query, asPath } const props = await loadGetInitialProps(ErrorComponent, initProps) renderReactElement(createElement(ErrorComponent, props), errorContainer) } else { renderReactElement(createElement(ErrorDebugComponent, { error }), errorContainer) } } async function doRender ({ Component, props, hash, err, emitter: emitterProp = emitter }) { if (!props && Component && Component !== ErrorComponent && lastAppProps.Component === ErrorComponent) { // fetch props if ErrorComponent was replaced with a page component by HMR const { pathname, query, asPath } = router props = await loadGetInitialProps(Component, { err, pathname, query, asPath }) } Component = Component || lastAppProps.Component props = props || lastAppProps.props const appProps = { Component, props, hash, err, router, headManager } // lastAppProps has to be set before ReactDom.render to account for ReactDom throwing an error. lastAppProps = appProps emitterProp.emit('before-reactdom-render', { Component, ErrorComponent, appProps }) // We need to clear any existing runtime error messages ReactDOM.unmountComponentAtNode(errorContainer) renderReactElement(createElement(App, appProps), appContainer) emitterProp.emit('after-reactdom-render', { Component, ErrorComponent, appProps }) } let isInitialRender = true function renderReactElement (reactEl, domEl) { // The check for `.hydrate` is there to support React alternatives like preact if (isInitialRender && typeof ReactDOM.hydrate === 'function') { ReactDOM.hydrate(reactEl, domEl) isInitialRender = false } else { ReactDOM.render(reactEl, domEl) } }